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Group 2: Evolution

This teaching tidbit focuses on introducing the concept of evolution to freshmen in an introductory biology course. The unit covers core terminologies, concepts, and the history of evolution, as well as providing evidence for the process. The learning goals include understanding variation, selection, and the role of time in evolution. The tidbit also addresses misconceptions about individual evolution and explores the process of domestication.

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Group 2: Evolution

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  1. Group 2: Evolution Fordham University: Rose Carlson Evon Hekkala Gerard Iwantsch Yale University: Tiffany Tsang Andy Phillips Facilitators: Marvin O’Neal III and Carl Hashimoto

  2. Evolution teaching tidbit Who? How many?Introductory biology for majors (freshmen). 60-75 students. Background? Co-requisites of chemistry and calculus. Some understanding/knowledge of nomenclature from high school biology (expected to vary among students). 1 1 Framework of Teachable Unit (Evidence for evolution) 2 2 3 1-2 hours of class time Core Terminologies, Concepts, History Teaching Tidbit Concluding Remarks

  3. Framework Learning Goals for the teaching unit : In this unit, students will: • Understand that variation exists within a population. • Understand the concept of selection. • Understand that organisms evolve over multiple generations (i.e. time). • Be able to evaluate evidence for evolution. • Dispel the misconception that individuals evolve.

  4. GOAL: Understand that natural selection acts on existing variation in a population. Learning Objectives: 1. Be able to construct a concept map using the terms evolution, variation, time, selection, and reproduction. 2. Be able to identify and then describe the steps that one would take to domesticate a wild species.

  5. Do Individuals Evolve? Use your clickers to choose one answer: A = Yes B = No

  6. The idea that an individual changes in response to natural selection is a common misconception in evolutionary biology. stretches its neck and passes this change on to its offspring long-necked individuals lots of time short-necked individual Lamarck

  7. The idea that an individual changes in response to natural selection is a common misconception in evolutionary biology. stretches its neck and passes this change on to its offspring long-necked individuals lots of time short-necked individual Lamarck descendent population with, on average, longer necks lots of time natural selection favors longer necks original population showing variation in neck length Darwin

  8. How did we get a Maltese from a wolf? Trivial Pursuit factoid: this only took about 15000 years…

  9. Artificial selection intentional breeding (by humans) of animals or plants for certain traits.

  10. Artificial selection: wolves to many breeds of dogs. wolf ancestor

  11. Artificial selection: Brassica to broccoli.

  12. Activity (5 minutes) • Construct a concept map with a partner using the following terms: time, evolution, reproduction, variation, and selection. Remember how to draw a concept map?

  13. One possible concept map… selection on variation +/- time reproduction evolution/ Δ variation

  14. Domestication • a process by which a population of organisms • becomes • adapted to the captive environment, • occurring over generations artificial selection is the selective force in domestication

  15. Which of these images is an example of domestication? (Use your clickers to select one answer). A. B. C. D.

  16. From wild foxes to domesticated foxes in 30 generations flat! • Describe how the Russian scientists domesticated the foxes. THINK (for 1 minute)

  17. From wild foxes to domesticated foxes in 30 generations flat! • Describe how the Russian scientists domesticated the foxes. THINK (for 1 minute) PAIR, and SHARE

  18. REVIEW: the key elements required for domestication. • A population with existing (heritable) variation • A human-induced selective force • Multiple generations (i.e. time)

  19. Natural vs. artificial selection • The two types of selection are similar. • However, artificial selection works much more quickly because the selective forces are stronger and the changes tend to be directional

  20. Homework:Based on today’s material, think about which features of a species might make it easier or more difficult to domesticate.

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